Path movement has set_path, not set_trajectory.
Fix doxygen warnings.
Updating the Lua doc.
Update the Lua documentation of sol.video.
Update the Lua doc of languages.
Update the Lua doc of menus.
Timers for sol.main are already enabled from MainAPI.cpp.
Lua: timer_stop_all does not exist anymore.
Redesigning Lua timers to simplify their usage.
Timers: make a getter and a setter for with_sound.
Lua timers: implement is/set_with_sound and remove dead code.
Simplify storage of timers and implement the new sol.timer.start().
Lua timers: move the context to the first parameter of sol.timer.start.
Update existing scripts to the new Lua timer API.
Simplify how transitions are applied on displayable objects.
Fix timers.
Add an opening transition to the savegame menu.
Reorganize and reindent Sprite.h.
Use std::string directly instead of useless typedefs.
Transitions effects can now be applied on sprites.